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Financial Instruments - Level 3 Fair Value Sensitivity Analysis - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Other Investments - Equity Securities (FVOCI) [Member] |  |
Disclosure of Fair Value Measurement [Line Items] |  |
Equity instruments basis points |  | 1.00%
Other Liabilities Related to Business Combination [Member] |  |
Disclosure of Fair Value Measurement [Line Items] |  |
Change in other liabilities related to business combination | 1.00% | 1.00%

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- Details
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